Wall-paper trimmer and straight-edge



(No Model.) 7 r A. J. GIBSON.

WALL PAPER TRIMMER AND STRAIGHT EDGE. 110.417.167. Patented Dec. 10,1889;

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UNITED STATES PATENT OFFICE.

ANDREV J..GIBSON, OF PONTIAC, ILLINOIS.

WALL-PAPER TRIMMER AND STRAIGHT-EDGE.

SPECIFICATION forming part of Letters Patent N0. 417,167, dated December10, 1889. i

' Application filed August 8, 1888. Serial No. 282,279. (No model.)

To all whom it may concern.-

Be it known that 1, ANDREW .T. GIBsoN, of Pontiac, in the county ofLivingston and State of Illinois, have invented certain new and usefulImprovements in \Vall-Paper Trimmers and Straight-Edges, of which thefol lowing is a full, clear, and exact description, reference being hadto the accompanying drawings, and to the letters of reference markedthereon.

The object of my invention to provide simple and effective devices fortrimming the edges of rolls of wall-paper even and rapidly,substantially as hereinafter described, and as illustrated in thedrawings, in which Figure 1 is a side elevation of my improved trimmerand straight-edge. Fig. 2 is a transverse vertical section of thestraight-edge with an end View of the trimmer cutters in positionthereon. Fig. shows a plan view of the same.

Reference being had to the drawings, A and B represent two strips ofwood of corresponding lengthsay about eight feet long-which are hingedtogether at one end, so that their broad sides can lie fiat against eachother, and which are fastened when closed together by a suitable catch.This catch consists'of a leaf-spring a, which is secured to the end ofthe lower strip 15 and projects upward in front of the adjacent end ofthe upper strip.

It has a hole in said upper end which snaps over a pin 71, projectingfrom the end of said upper strip. The upper strip should be about aneighth to onequarter of an inch wider than the under strip, and it ispreferably provided with a longitudinal groove (1 therein. These twostrips A and B constitute my straight-edge, and it will be observed thatthe extra width of the upper strip overhangs the right-hand side of theunder strip.

The wall-paper D is placed between the strip of the straight-edge, sothat the blank edge which it is desired to cut off extends parallel withand just beyond the right-hand edge of the upper strip. In this positionthe said blank edge of the paper is cut oil? neatly and evenly by myimproved trimmer. This trimmer consists of two disk-shaped cutters E andF, which have their edges beveled, so as to oppose each other and so asto present sharp cutting-edges. The diameter of the upper cutter E issuch that a segment of its cutting-edge projects just below thehorizontal plane of the under surface of the upper strip A of thestraight-edge, and the relative position of the under cutter F to theupper cutter is such that its cutting-edges lap and bear against thatsegment of said upper cutter that extends past the under surface of saidupper strip of the straight-edge.

The trimmer is so placed that the upper cutter bears flat against theright-hand strip of the straight-edge, and in order to out the blankedge of the paper it is moved longitudinally along the edge of saidstraight-edge, always maintaining the relative position thereto justdescribed.

The cutters E and F are kept in the relative position above alluded toby being journaled by suitable means (as will hereinafter be more fullyexplained) in the ends of the arms d and e of the frame G, the shank ofwhich latter is secured in a suitable handle f, by means of which latterthe trimmer is manipulated.

It is desirable that the upper cutter should be provided with some meansfor holding it against the upper strip of the straight-edge and toinsure its revolving. To accomplish this I secure concentrically to theinner face of the cutter a sleeve g, which extends transversely over theupper surface of the upper strip of the straight-edge past thelongitudinal groove 0 therein. Extending from this sleeve in suchposition that it enters said groove (1 is a circumferential collar 76,and between this collar h and the end of sleeve with a rubber tire II,which bears against and rolls upon the upper strip of the straight-edge,as shown in the drawings, I journal said sleeve and cutter on the barrelof a bolt 7;, which passes through the extremity of arm 0 of frame G,where it is held by a nut 7. Thus as the trimmer is moved longitudinallythe collar It keeps the cutter against the straightedge, and the rubbertire l'I insures the revolution of the upper cutter.

In order to keep the cutters in about the position shown in Fig. 1thatis, so that their centers will be intersected by avvertical line whilecutting the paper-l extend laterally from frame G, about at theconfluence of arms (1 and 6, so that it will bear and roll upon theupper surface of strip A, the roller m. This sleeve on has its endadjacent to the groove (1 provided with a flange m, which enters saidgroove,a11d itis secured to said frame G by a bolt and nut 12, as shown.

If desired, the groove c in the upper strip A of the straight-edge maybedispensed with and the flanges m of roller m and h of sleeve g maybeomitted. I prefer their use, however, because it is not necessary whenthey are embodied in the trimmer for the skill of the operator to keepthe trimmer against the straight-edge. I do not moreover, consider thefriction-generating tire H an indispensable feature of my invention, asthe contact of the cutting-edges of the cutter might be depended upon toimpart a revolving motion thereto during the cutting operation.

\Vhile not considered desirable, yet it is possible for the upper cutterof the trimmer to be dispensed with and to cut the paper by making theunder cutter bear up against the overhanging edge of the upper strip ofthe straight-edge.

\Vhat Iclaim is The combination, with a straight-edge consisting ofstrips A and B, having therein 1ongitudinal grooves c, of cutters, frameG, in which said cutters are journaled, and sleeves m and g, having acollar h and flange m on them, respectively, as and for the purpose setforth. 1

ANDREW J. GIBSON.

Witnesses JOSEPH T. KAY, JOHN S. MURPHY, FRANK D. THOMASON.

